Prepare for 4.2.0 release #558

Job	Run time
CI test (make validate)	35s
Code coverage (codecov)	0s
Build moodle-plugin-ci.phar	33s
Integration tests (8.2, main)	5m 30s
Integration tests (8.2, MOODLE_403_STABLE)	5m 4s
Integration tests (8.2, MOODLE_402_STABLE)	4m 58s
Integration tests (8.1, MOODLE_401_STABLE)	6m 7s
Integration tests (8.0, MOODLE_400_STABLE)	5m 50s
Integration tests (8.0, MOODLE_311_STABLE)	5m 28s
Integration tests (7.4, MOODLE_310_STABLE)	4m 52s
Integration tests (7.4, MOODLE_39_STABLE)	5m 18s
Integration tests (7.4, MOODLE_38_STABLE)	5m 22s
Integration tests (PHAR) (8.2, main)	5m 10s
Integration tests (PHAR) (8.1, MOODLE_403_STABLE)	4m 57s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	5m 51s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 14s
	1h 10m 49s

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